Appeal No. 2001-2100
Application No. 08/833,302
system in the control equipment. Further provided is a loop back
circuit which permits test cells generated within the
transmission system to be supplied to a receiving system in the
control equipment. According to Appellant (specification, pages
6 and 7), since the ATM control equipment provides its own
testing functionality, the time and expense of providing
dedicated external testing equipment is avoided.
Claim 1 is illustrative of the invention and reads as
follows:
1. A communication control equipment used for ATM
communication including a transmission system adapted so that
data cell sent from an ATM layer control unit is inputted thereto
to convert the data cell into frame data to transmit the frame
data to transmission line, a receiving system adapted so that the
frame data sent from the transmission line is inputted thereto to
convert the frame data into data cell to transmit the data cell
to the ATM layer control unit, and a loop-back line or circuit
for carrying out loop-back of the data cell inputted to the
transmission system to deliver the data cell to the receiving
system,
wherein the transmission system comprises a transmission
cell processing section including:
an idle cell generating circuit for generating and
outputting idle cell;
a test cell generating circuit for generating and outputting
test cell; and
selector means operative so that when data cell sent from
the ATM layer control unit is delivered thereto, the selector
means outputs the data cell, when output of test cell is
designated and no data cell exists, the selector means outputs
-2–2
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